When I try start the recorder (BOSS BR 1180 CD), the display and those two light (light-diodes), ( (peak- diodes, placed just under SENS POT-METER ( Guitar- mic 2 / Mic 1 ), upper left of the unit, just flash up for a very short moment.
I've also tryied checked the voltage in differ places, and it looks like I have the + 12 V. power ( 72015301 Main Board Assy ) When I meassure on connector CN 109 (4-pins, named B4B-XH-A, located down right on the Main Board Assy), I can meassure + 12 V, but short of the + 5 V, which means that the + 5 V Power Board Assy, are feeded with the 12 V, but missing the + 5 V. (connector CN 114 on the + 5 V Power Board Assy)
At last I will mention that when I pull the Main Power Swich Breaker on, I can meassure a short reaktion , similar to the time of the ligt diodes when try starting the recorder. (I can read a small signal on my volt-meter, about 1,2 - 1,5 V, but dies out in milli-secounds).
Is this a well-known problem ? It looks like a short-cut, but hope not.
Hope someone can help me.
From
Magne Gillebo, 6600 Sunndalsøra, Norway
You can try it again but this time disconnect the +5v from from load and measure again the voltage. if there is a + 5V . try to reconnect it again then take measure again if it will drop , I suspect a short ckt. is there a semiconductor over heating?
In order to properly check some parts of the circuit board, you will need to unsolder one end of it (or better said all leads except for one) i would start with some of the diodes that come from the main power source. and test for diode functionality..(voltage one way and none the other) and if those check out ok you can move onto the smaller transistors (the small 3 legged ones which are easier to remove by putting a soldering iron across all 3 solder pads and pulling the part out) Remember which way it was facing as well. Then test the transistors from the emitter to the base... and switch leads..should get a resistance one way and none the other, kind of like a diode....then the collector to the base...same thing... (can research a little on testing transistors) most case the middle is the base and the outside leads can be the Emitter and other the collector. Again focus on the ones starting at the problem points... might want to re-install the ones that test ok to prevent any mistakes. If you find a part thats not reading properly, you can order them from an electronics store or even online to have them mailed to you...just get the info from the part itself. Most of the time Capacitors bulge or blister when they fail. and most of the smaller IC's act as a transistor also but tend to not fail (very rare) the Diodes...small fuses and transistors are usually the culprit. I Hope This helps give you at least a starting point in solving this problem.
PS make sure you are using a tester with a 9V battery....some use AA's which do NOT produce enough voltage to test these parts.
8-)
Something to add is the possibility that the switch itself isnt maintaining a contact, it could be a momentary switch (which is what it might supposed to be) or it could be a pushbutton switch that has broken and thus become a "Momentary switch" You can also try to hold the button in and try to operate it. If it does not work then, then go ahead and test some components (while its tuned off) and good luck with the troubleshooting. Keep posting and ill keep answering. (i slept on this one and thought of this simple fix possibility)
8-)
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Hi there,
This problem seems like there is some register or condenser not working properly.
first of all you need to check for any blown condenser on the board.
post comment for more help.
Thanks
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OK, I come back later.
Magne Gillebo
Hey there...
Me again....
Can you give me a "hint" where I can serch for the mentioned condenser / capacitor.
Do you agree that the location for the conductor (C) may be on the Main Board Assy.
Finaly, when you say register.
What do you exactly mean ? (do this belongs to the H.D ?)place condensor
Magne Gillebo
Soory, just a empty letter
M. Gillebo
Hey, hey....
Priciates you help.
I know there can be a problem, even for you, to sit miles away to fix problems like this.
Your solutions could absolutely have given an end of my problems, but in this case, they didn't.
Anyway, this was the reason. (the simplyest is sometimes the easyest)
The real reason were a broken conection in the flat 18P-cable, (the connection between CN 112
and CN 107) Seventeen of eighteen were broken.
In the "block diagram", which I've used for this ((Service Notes, Issued by RJA, may 2002),
opperatin, there's a misleading / defect on the mentioned bloc-diagram.
The Connector CN 107, are named as CN 117.
Finally, I would like to ask you if there are any way to upgrade my BR 1180 CD.
What about the fragmentation of the HD. Are there any ways for deregmentation ?
Thank you very much, and so long.
Priciate an answer.
Magne Gillebo.
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